Kyushu University Academic Staff Educational and Research Activities Database
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TODA HIROYUKI Last modified date:2022.06.30

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Structural Materials research Lab. .
Academic Degree
Doctor of Engineering
Country of degree conferring institution (Overseas)
Field of Specialization
Strength of Materials, Mechanical Properties of Materials
Total Priod of education and research career in the foreign country
Outline Activities
I have lead a research group exploring materials strength and characterisation in 3D/4D. My research is in the field of deformation, fracture and fatigue on a wide range of structural/functional materials. A major focus is the exploration of the microstructure and the microstructure-property relations of such materials utilizing synchrotron X-ray microtomography at the third generation facilities, in particular the development of advanced 3D/4D measurements of stress/strain, crack-driving forces, chemical composition and crystallographic information in high density together with their applications to various issues in materials and mechanical engineerings. Recently we have proposed a new concept entitled "Reverse 4D Materials Engineering", in which the complex morphologies of existing materials is taken into account to realize a paradigm shift in materials development for structural/functional materials. We are also in charge of the development of new innovative aerospace materials that is based on a real fracture behavior that has been achiebved by applying the above-mentioned techniques.
Research Interests
  • 3D / 4D multi-scale / multi-modal materials science developed by ultra high resolution X-ray microscope
    keyword : Synchrotron radiation, Microtomography, Mechanical properties, Structural materials, Imaging CT, X-ray microscopy
  • Half-spontaneous interfacial debonding: Tomography bridging nano and macro scales
    keyword : Synchrotron radiation, Micro・nanotomography, Hydrogen embrittlement, Aluminum, First principles somulation, Hydrogen partitioning
  • 3D / 4D mesoscale materials science developed by ultrahigh magnification X-ray microscope
    keyword : Synchrotron radiation, Microtomography, Mechanical properties, Structural materials, Imaging CT, X-ray microscopy
  • Science of fatigue and fracture: Three-dimensional analyses of crack-tip using synchrotron radiation
    keyword : Synchrotron radiation, Microtomography, fatigue fracture, Tracking, Strain, Crack driving force, Mapping, Titanium alloys
  • Optimisation of microstructures in aluminium alloys via hydrogen partitioning control
    keyword : Synchrotron radiation, Microtomography, Mechanical properties, Hydrogen trapping, Hydrogen embrittlement, Pore, Tracking, Strain, Mapping, Aluminum alloys
  • Image-based analyses in 3D/4D and their application to structural materials
    keyword : Synchrotron radiation, Microtomography, Mechanical properties, Structural materials, Tracking, Strain, Chemical concentration, Crack driving force, Mapping, Steels, Aluminum alloys
  • Development of new innovative aerospace materials
    keyword : Synchrotron radiation, Microtomography, Mechanical properties, Structural materials, Hydrogen, Pore, 3D/4D analyses
  • A New Concept Breakthrough in Materials Development: Reverse 4D Materials Engineering
    keyword : Synchrotron radiation, Microtomography, Mechanical properties, Structural materials, Optimization, Coarsening, Image-based simulation
  • Crystallographic deformation behaviors of polycrystalline materials
    keyword : Synchrotron radiation, Microtomography, X-ray difffraction, Polycrystalline materials, Crystallographic orientation, Deformation, Fracture, Damage, Structural materials
Academic Activities
1. H. Toda, X-Ray CT: Hardware and Software Techniques, Springer Nature Singapore Pte Ltd., 2021.03, 医学用以外でX線CTに特化した専門書・テキストは、和書だけではなく海外の英書を見てもほとんど無く、あっても内容が薄かったり偏りのあるものである。著者がこれまで得てきた科研費基盤(S)1件、基盤(A)2件など、およびJSTやNEDO、内閣府などのナショナルプロジェクトの成果を全て網羅し、この分野で重要な知見を漏れなく紹介している。同時に、これを理解するのに必要な素養、知識、学術も合わせて網羅して体系的な専門書とすることで、この研究分野のバイブルとする事に成功した。この研究分野の多くの研究者、企業の技術者が手にしてこれを元に業務を推進しており、この分野にはなくてはならない成書となっている。科研費(研究成果公開促進)の学術図書部門で申請して採択された。これにより科研費の助成により英書が海外の出版社(Springer社)から出版された。国内外で次世代への当該先端技術の普及と継承、国際的な研究分野の先導などがなされることになる。.
2. Y. Suzuki, H. Toda, "Tomography using magnifying optics", Advanced Tomographic Methods in Materials Research and Engineering, Section 7.1 "Fresnel zone-plate microscopy and microtomography" in Chapter 7, Oxford University Press, 2008.03.
1. H.Toda, K. Hirayama, K. Okamura, T. Suzuki, A. Takeuchi, M. Uesugi, H. Fujihara, Multimodal assessment of mechanically induced transformation in metastable multi‐phase steel using X‐ray nano‐tomography and pencil‐beam diffraction tomography, Acta Materialia, 10.1016/j.actamat.2022.117956, 234, 117956, 2022.08.
2. Y.Wang, H. Toda, Y. Xu, K. Shimizu, K. Hirayama, H. Fujihara, A. Takeuchi, M. Uesugi, In-situ 3D observation of hydrogen-assisted particle damage behavior in 7075 Al alloy by synchrotron X-ray tomography, Acta Materialia, 10.1016/j.actamat.2022.117658, 227, 117658, 2022.02, Al-Zn-Mg合金でZn量を10%まで増やした新奇高強度合金を作製し、その水素脆化挙動をシンクロトロン放射光を用いた超高分解能3D連続観察で明らかにした。この合金の水素脆化挙動を解明すると共に、その防止策も提案した。.
3. K. Hirayama, H. Toda, D. Fu, R. Masunaga, H. Su, K. Shimizu, A. Takeuchi and M. Uesugi, Damage micromechanisms of stress corrosion cracking in Al-Mg alloy with high magnesium content, Corrosion Science, 10.1016/j.corsci.2021.109343, 184, 109343, 2021.05, Al-Mg合金でMg量を10%まで増やした新奇高強度合金を作製し、その応力腐食割れ挙動をシンクロトロン放射光を用いた超高分解能3D連続観察で明らかにした。この合金の応力腐食割れ挙動を解明すると共に、その防止策も提案した。.
4. Tomohito Tsuru, Kazuyuki Shimizu, Masatake Yamaguchi, Mitsuhiro Itakura, Kenichi Ebihara, Artenis Bendo, Kenji Matsuda, Hiroyuki Toda, Hydrogen-accelerated spontaneous microcracking in high-strength aluminium alloys, Scientific Reports, 10.1038/s41598-020-58834-6, 10, 2020.04, 受賞論文名:「Hydrogen-accelerated spontaneous microcracking in high-strength aluminium alloys」。CRESTプロジェクト(研究代表者:戸田裕之)の成果を国際的に著名な英文誌に投稿したもの。インパクトファクターの高い国際誌:Scientific Reports誌(インパクトファクター:4~6)のVol. 10に掲載された。アルミニウムというありふれた構造材料中に存在するよく知られた界面における新奇な現象(水素による半自発的な剥離挙動)を発見して報告した。.
5. H. Su, H. Toda, K. Shimizu, K. Uesugi, A. Takeuchi, Y. Watanabe, Assessment of hydrogen embrittlement via image-based techniques in Al–Zn–Mg–Cu aluminum alloys, Acta Materialia, 10.1016/j.actamat.2019.06.056, 176, 96-108, 2019.09.
6. H. Li, H. Toda, K. Uesugi, A. Takeuchi, Y. Suzuki, M. Kobayashi, Application of diffraction-amalgamated grain boundary tracking to fatigue crack propagation behavior in high strength aluminum alloy, Materials Transactions, 10.2320/matertrans.M2014340, 56, 3, 424-428, 2015.03.
7. H. Toda, Y. Ohkawa, T. Kamiko, T. Naganuma, K. Uesugi, A. Takeuchi, Y. Suzuki, M. Kobayashi, Grain boundary tracking technique: four-dimensional visualisation technique for determining grain boundary geometry with local strain mapping, Acta Materialia, 61, 14, 5535-5548, 2013.08, SPring-8を利用したX線CTを用いれば、結晶粒界にある粒子が鮮明に3D観察できることに着目した。このような粒子は、金属が変形し、破壊していく過程でも常に結晶粒界に位置する為、結晶粒界の粒子の情報を使えば、個々の結晶の形を4Dで求めることができると発想した。2011年度には、この手法を実用的な構造材料に適用できるレベルにまで高精度化することに成功した。この手法により、多結晶材料中のすべての結晶粒の形状の変化を時間を遡りながら4Dで観察することができるようになった。この成果は、金属材料工学では最も権威のある英文誌であるアクタ・マテリアリア誌に掲載が決定された。.
8. H. Toda, K. Tsubone, K. Shimizu, K. Uesugi, A. Takeuchi, Y. Suzuki, M. Nakazawa, Y. Aokic, M. Kobayashi, Compression and recovery micro-mechanisms in flexible graphite, Carbon, 59, 184-191, 2013.08.
9. L. Qian, H. Toda, K. Uesugi, M. Kobayashi, T. Kobayashi, Direct observation and image-based simulation of three-dimensional tortuous crack evolution inside opaque materials, Physical Review Letters, 100, 11, 115505, 2008.11.
10. L. Li, H. Toda, T. Ohgaki, M. Kobayashi, T. Kobayashi, K. Uesugi, Y. Suzuki, Wavelet-based local region-of-interest reconstruction for synchrotron radiation X-ray microtomography, Journal of Applied Physics, 102, 114908-1-9, 2007.01.
11. L. Qian, H. Toda, K. Uesugi, T. Kobayashi, T. Ohgaki, M. Kobayashi, Application of synchrotron x-ray microtomography to investigate ductile fracture in Al alloys, Applied Physics Letters, 10.1063/1.214208, 87, 24, 241907, 2005.12.
12. H. Toda, J. Katano, T. Kobayashi, T. Akahori, M. Niinomi, Assessment of thermo-mechanical fatigue behaviors of cast Al-Si alloys by experiments and multi-step numerical simulation, Materials Transactions, 46, 1, 111-117, 2005.01.
13. H. Toda, I. Sinclair, J.-Y. Buffiere, E.Maire, T. Connolley, M. Joyce, K.H. Khor, P. Gregson, Assessment of fatigue crack closure phenomenon in damage tolerant aluminium alloy by in-situ high-resolution synchrotron X-ray microtomography, Philosophical Magazine A, 83, 21, 2429-2448, 2003.07.
Membership in Academic Society
  • The Japan Institute of Light Metals
  • Japan Foundry Engineering Society
  • The Iron and Steel Institute of Japan
  • The Japan Institute of Metals and Materials
  • The Japan Society of Mechanical Engineers
  • The Society of Materials Science
  • JSPS 147th Committee
  • JSPS 176th Committee
  • SPring-8 users community
  • SPring-8 X-ray Micro/Nano-tomography Research Group
Educational Activities
I am teaching three courses on "Strength of Materials" in the bachelor course, which cover basic theories of strength of materials. I am also in charge of student experiments (mechanical testing). In the graduate school, I am teaching a course entitled "Evaluation of structural materials", "Strength of automobiles" and Introduction to automotive science". I also supervise several graduate students, several bachelor students and some pos-docs in the laboratory.